a seaport-town of Northern Italy, government of Venice, and 15 miles S. of that city, situated on a cognominal island at the southern extremity of the lagoon of Venice. It consists of a long wide street extending the whole length of the island, with smaller streets branching off at right angles; and is connected with the mainland by a low stone bridge of 43 arches. It is the seat of a bishop, and has a theological seminary, several schools and charitable institutions, shipbuilding yards, and important salt-works. Pop. 25,000, principally engaged in the coasting trade, in fishing, and in piloting vessels into the harbour of Venice.